Would you not listen to some one who has more then one of them & stated such in a post before yours ?

If he stated it was shorter the normal would you not think shorter than the 10 shot mag ?

A lot of the BSA/Lee Speed sporters had 10rd mags, around a third of mine have them, I differentiate between the Lee Speed-BSA sporter & the later plain stocked nonengraved BSA sporter which mostly has the 10 shot mag but again a few came or had fitted the shorter mag, hard to tell if these are factory as no engraving on this later model, having said that one of mine was, it was missing the fore wood so I don't know what type it had unfortunately.